linux/include/linux/huge_mm.h
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   1#ifndef _LINUX_HUGE_MM_H
   2#define _LINUX_HUGE_MM_H
   3
   4extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
   5                                      struct vm_area_struct *vma,
   6                                      unsigned long address, pmd_t *pmd,
   7                                      unsigned int flags);
   8extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
   9                         pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
  10                         struct vm_area_struct *vma);
  11extern void huge_pmd_set_accessed(struct mm_struct *mm,
  12                                  struct vm_area_struct *vma,
  13                                  unsigned long address, pmd_t *pmd,
  14                                  pmd_t orig_pmd, int dirty);
  15extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
  16                               unsigned long address, pmd_t *pmd,
  17                               pmd_t orig_pmd);
  18extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
  19                                          unsigned long addr,
  20                                          pmd_t *pmd,
  21                                          unsigned int flags);
  22extern int zap_huge_pmd(struct mmu_gather *tlb,
  23                        struct vm_area_struct *vma,
  24                        pmd_t *pmd, unsigned long addr);
  25extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  26                        unsigned long addr, unsigned long end,
  27                        unsigned char *vec);
  28extern int move_huge_pmd(struct vm_area_struct *vma,
  29                         struct vm_area_struct *new_vma,
  30                         unsigned long old_addr,
  31                         unsigned long new_addr, unsigned long old_end,
  32                         pmd_t *old_pmd, pmd_t *new_pmd);
  33extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  34                        unsigned long addr, pgprot_t newprot,
  35                        int prot_numa);
  36
  37enum transparent_hugepage_flag {
  38        TRANSPARENT_HUGEPAGE_FLAG,
  39        TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
  40        TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
  41        TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
  42        TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
  43        TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
  44#ifdef CONFIG_DEBUG_VM
  45        TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
  46#endif
  47};
  48
  49enum page_check_address_pmd_flag {
  50        PAGE_CHECK_ADDRESS_PMD_FLAG,
  51        PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
  52        PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
  53};
  54extern pmd_t *page_check_address_pmd(struct page *page,
  55                                     struct mm_struct *mm,
  56                                     unsigned long address,
  57                                     enum page_check_address_pmd_flag flag);
  58
  59#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
  60#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
  61
  62#ifdef CONFIG_TRANSPARENT_HUGEPAGE
  63#define HPAGE_PMD_SHIFT HPAGE_SHIFT
  64#define HPAGE_PMD_MASK HPAGE_MASK
  65#define HPAGE_PMD_SIZE HPAGE_SIZE
  66
  67extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
  68
  69#define transparent_hugepage_enabled(__vma)                             \
  70        ((transparent_hugepage_flags &                                  \
  71          (1<<TRANSPARENT_HUGEPAGE_FLAG) ||                             \
  72          (transparent_hugepage_flags &                                 \
  73           (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&                   \
  74           ((__vma)->vm_flags & VM_HUGEPAGE))) &&                       \
  75         !((__vma)->vm_flags & VM_NOHUGEPAGE) &&                        \
  76         !is_vma_temporary_stack(__vma))
  77#define transparent_hugepage_defrag(__vma)                              \
  78        ((transparent_hugepage_flags &                                  \
  79          (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) ||                     \
  80         (transparent_hugepage_flags &                                  \
  81          (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) &&             \
  82          (__vma)->vm_flags & VM_HUGEPAGE))
  83#define transparent_hugepage_use_zero_page()                            \
  84        (transparent_hugepage_flags &                                   \
  85         (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
  86#ifdef CONFIG_DEBUG_VM
  87#define transparent_hugepage_debug_cow()                                \
  88        (transparent_hugepage_flags &                                   \
  89         (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
  90#else /* CONFIG_DEBUG_VM */
  91#define transparent_hugepage_debug_cow() 0
  92#endif /* CONFIG_DEBUG_VM */
  93
  94extern unsigned long transparent_hugepage_flags;
  95extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  96                          pmd_t *dst_pmd, pmd_t *src_pmd,
  97                          struct vm_area_struct *vma,
  98                          unsigned long addr, unsigned long end);
  99extern int handle_pte_fault(struct mm_struct *mm,
 100                            struct vm_area_struct *vma, unsigned long address,
 101                            pte_t *pte, pmd_t *pmd, unsigned int flags);
 102extern int split_huge_page(struct page *page);
 103extern void __split_huge_page_pmd(struct vm_area_struct *vma,
 104                unsigned long address, pmd_t *pmd);
 105#define split_huge_page_pmd(__vma, __address, __pmd)                    \
 106        do {                                                            \
 107                pmd_t *____pmd = (__pmd);                               \
 108                if (unlikely(pmd_trans_huge(*____pmd)))                 \
 109                        __split_huge_page_pmd(__vma, __address,         \
 110                                        ____pmd);                       \
 111        }  while (0)
 112#define wait_split_huge_page(__anon_vma, __pmd)                         \
 113        do {                                                            \
 114                pmd_t *____pmd = (__pmd);                               \
 115                anon_vma_lock_write(__anon_vma);                        \
 116                anon_vma_unlock(__anon_vma);                            \
 117                BUG_ON(pmd_trans_splitting(*____pmd) ||                 \
 118                       pmd_trans_huge(*____pmd));                       \
 119        } while (0)
 120extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
 121                pmd_t *pmd);
 122#if HPAGE_PMD_ORDER > MAX_ORDER
 123#error "hugepages can't be allocated by the buddy allocator"
 124#endif
 125extern int hugepage_madvise(struct vm_area_struct *vma,
 126                            unsigned long *vm_flags, int advice);
 127extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
 128                                    unsigned long start,
 129                                    unsigned long end,
 130                                    long adjust_next);
 131extern int __pmd_trans_huge_lock(pmd_t *pmd,
 132                                 struct vm_area_struct *vma);
 133/* mmap_sem must be held on entry */
 134static inline int pmd_trans_huge_lock(pmd_t *pmd,
 135                                      struct vm_area_struct *vma)
 136{
 137        VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
 138        if (pmd_trans_huge(*pmd))
 139                return __pmd_trans_huge_lock(pmd, vma);
 140        else
 141                return 0;
 142}
 143static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 144                                         unsigned long start,
 145                                         unsigned long end,
 146                                         long adjust_next)
 147{
 148        if (!vma->anon_vma || vma->vm_ops)
 149                return;
 150        __vma_adjust_trans_huge(vma, start, end, adjust_next);
 151}
 152static inline int hpage_nr_pages(struct page *page)
 153{
 154        if (unlikely(PageTransHuge(page)))
 155                return HPAGE_PMD_NR;
 156        return 1;
 157}
 158static inline struct page *compound_trans_head(struct page *page)
 159{
 160        if (PageTail(page)) {
 161                struct page *head;
 162                head = page->first_page;
 163                smp_rmb();
 164                /*
 165                 * head may be a dangling pointer.
 166                 * __split_huge_page_refcount clears PageTail before
 167                 * overwriting first_page, so if PageTail is still
 168                 * there it means the head pointer isn't dangling.
 169                 */
 170                if (PageTail(page))
 171                        return head;
 172        }
 173        return page;
 174}
 175
 176extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 177                                unsigned long addr, pmd_t pmd, pmd_t *pmdp);
 178
 179#else /* CONFIG_TRANSPARENT_HUGEPAGE */
 180#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
 181#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
 182#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
 183
 184#define hpage_nr_pages(x) 1
 185
 186#define transparent_hugepage_enabled(__vma) 0
 187
 188#define transparent_hugepage_flags 0UL
 189static inline int split_huge_page(struct page *page)
 190{
 191        return 0;
 192}
 193#define split_huge_page_pmd(__vma, __address, __pmd)    \
 194        do { } while (0)
 195#define wait_split_huge_page(__anon_vma, __pmd) \
 196        do { } while (0)
 197#define split_huge_page_pmd_mm(__mm, __address, __pmd)  \
 198        do { } while (0)
 199#define compound_trans_head(page) compound_head(page)
 200static inline int hugepage_madvise(struct vm_area_struct *vma,
 201                                   unsigned long *vm_flags, int advice)
 202{
 203        BUG();
 204        return 0;
 205}
 206static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 207                                         unsigned long start,
 208                                         unsigned long end,
 209                                         long adjust_next)
 210{
 211}
 212static inline int pmd_trans_huge_lock(pmd_t *pmd,
 213                                      struct vm_area_struct *vma)
 214{
 215        return 0;
 216}
 217
 218static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 219                                        unsigned long addr, pmd_t pmd, pmd_t *pmdp)
 220{
 221        return 0;
 222}
 223
 224#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 225
 226#endif /* _LINUX_HUGE_MM_H */
 227
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